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Methods of Correction for the “Wet” Atmosphere in Estimating Baseline Lengths from VLBI

Published online by Cambridge University Press:  03 August 2017

G. Elgered ,
J. L. Davis ,
T. A. Herring  and
I. I. Shapiro
G. Elgered
Affiliation:
Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138
J. L. Davis
Affiliation:
Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138
T. A. Herring
Affiliation:
Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138
I. I. Shapiro
Affiliation:
Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138

Abstract

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The error in VLBI estimates of baseline length caused by unmodelled variations in the propagation path through the atmosphere is greater for longer baselines. We present and discuss series of estimates of baseline lengths obtained using different methods to correct for the propagation delay caused by atmospheric water vapor. The main methods are use of data from a water-vapor radiometer (WVR) and Kalman-filtering of the VLBI data themselves to estimate the propagation delay. Since the longest timespan of WVR data associated with geodetic VLBI experiments was obtained at the Onsala Space Observatory in Sweden, we present results for the following three baselines: (1) Onsala–Wettzell, FRG (920 km), (2) Onsala–Haystack/Westford, MA (5600 km), and (3) Onsala–Owens Valley (7914 km).

Type
Instrumentation and Analysis
Information
Symposium - International Astronomical Union , Volume 129: The Impact of VLBI on Astrophysics and Geophysics , 1988 , pp. 543 - 544
Copyright
Copyright © Reidel 1988 

References

Herring, T.A., J. Geophys. Res., 91, No. B9, pp. 9177–9182, 1986.CrossRefGoogle Scholar
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